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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20757f440278a41c5366164318a66540e1a57cb66388dc2e53f5161f15fb70c6' 
  AND token = 'BGiShw1gp/R3qo4fUY2zwahtzQDWfX2IBTZTM1MpwEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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