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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c87683ac6238a1bb5d3655a52f0e21e834ec7db38ebaf9bd86dbaf526b333154' 
  AND token = 'BrKxysThuxwaoJmnfHRxmPPlScigXe41KQqs+Eugc9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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