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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51ecd85844f8b0748dd715af17bfdc6bc316b19fae7b8a9de392b1f3b9b171c7' 
  AND token = '6oOn7mwYFsOoZe1yULPXNAFhGZd/qeE4lbC/G4djJNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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