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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '780a7594beab8740d764cb87d3344c35335fa3044f3cdecb5fa1d92883736ef7' 
  AND token = 'eunf9ZXvmdGQImii4NuBAjW3C1GN1ZwnL2YopdZZta4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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