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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '912b34dee30b5e600a16f61edfa1cb6fd2450add756e9ef7896010e846b0fc5d' 
  AND token = 'Jmlzm3FSPEyh7E5c75+xQ9FUPQ4sN7Cy2iCWLBFnpC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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