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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e345b2fba45ef9f8f96a90aa9550f4119671982898b04fd6cf1ba04f91ead3c2' 
  AND token = 'cT/pYn9Abqd4BQODmd39clE9t94fOzYqduA2pzq6vj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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