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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a76c13afb49c9c57942fe0927b2d218780444eb7f88a0632dd95140d784dc11' 
  AND token = 'bEAPcf4plFexurx2dlbf0Qd9apgiMXmrgSDK5LjCmYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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