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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69d7656a48118ae2dfa1b976781e92b65b52cfe0f900c4fb0e00470724f5b0fb' 
  AND token = 'zyB8XRZ8Gyv7bchPJ0nPT4Nbd0K9hePSF+kv7BP958I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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