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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04e432a53cf514e053447172e7fc01784f5eea122d9a7dacec7a49e6339e83cb' 
  AND token = 'H0QPZzMRY8CL8uhk8puNsO4bOErVb4sZ5JG3NGWwopM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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