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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '139b1bea69c4e70184eff2e67249fa49b5f7aeb509f30ae3ba7f7ebf9b9b9402' 
  AND token = '75HfnPTfU5H94I6Y+78JDs47u1YSolK7U4aZaLc9ViQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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