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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c077983a313915770ec9239baecac5254a10251960b30bd11006fa5e748bdb3' 
  AND token = 'CE2MuObhmDAHDhXAOEcCvbb9QfqxkQ+ZdcV9lyZdi00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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