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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a733e099cddf269ab1ebe4988734c908571efddaa5e29c1e8ba599d9d973c62e' 
  AND token = 'NXkblItrOwcq6bww7e/W0Q8z5WrkazWOnqNgMJ18vjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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