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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74b5fa292b7776941b7381b181e703b165f155b5ebf92ca884811ac24c752d2f' 
  AND token = 'lwFzN2kjnmG7Fj8SBYnkRN3aya56IkkjgjifS6dMalY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}