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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a50cfcd177ae094c4b82ad49cfbea507a08a54af1e69cd96456f5591d6653fc8' 
  AND token = 'jySCauXk4f9oSjR8M1LZxoMAkbJchvEkuPfE5IZ/Cxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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