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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e30dd04f3780f9ca62822b7f387a2f018153cd8be9eed9e3fc60dbedc2c7b2c' 
  AND token = '/BoL1Uge2RUKijZkUa6JtW10LaZJOwNV/+KaIqkPwL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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