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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ec3636a4272489d38f4c8284b07377bfbed2c5cae0886586a37d7f1d1429d00' 
  AND token = 'YjbLvpKMB9aodKpJLUfmP2Gbt4+tXMr5cQS4o9DdXIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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