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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '592aaa64bc2c3d2eda865ec679e6f50ba35a0a238361723f8152ecdff8248462' 
  AND token = 'tCgnxoHYjZ3bnd0un1Cjl6hZj7AfXnX08vMR1SwCm/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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