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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf9da17f50b416f68d11caecafa320c4cc5d833b21bfd3fc7dd315969715e5c3' 
  AND token = 'bIEkiSZIDn+O7DDmoANQSF8nTg+Zz3igH2GLSe+7XZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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