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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8d42883ac163731c21152ddce6f4666cdc9feed2bb24eefcd10164fa8c4bcbd' 
  AND token = 'I3k9WBKfvfPvE3YJb6cFNu+fEzh4BH/e92Bo1gvLSRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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