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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48d3edd66e82ca7785d35a57c5633ba45ebc28902c3467c9ea3f1f0b93a4a2e4' 
  AND token = 'Tl+OleOw9g0eFWDUugRho4Q7ScMMVyKaBTX9lsd8u7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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