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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cda5570ecc4c130f2014f8d97f34a0daf753280caf45a3a5c7e9ba4db0e7dc5f' 
  AND token = 'Bl3SxF2+ySEAIUYOFVOdhyGEyDF91lD3sjTZsXQaDRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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