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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72cefe054bc9048c2117c1a28544422741d4a55ed69ce211de4c74c62740a5a9' 
  AND token = '6QmY6+TAksPznjN978OS7Qysfrrn1Ne/8+5fI1EEDbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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