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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4823834a759f750dd078d7dc154aee4b14224a57c78a0e022e10e015f7fea36' 
  AND token = 'vPwbOWyll/JePZqPjcNiPjOOtoHSd0gpgRS4uP9lvHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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