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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '303ded4f2f4893be131a0a09f3d06b1f358bace2358abe502e260054795e7a96' 
  AND token = 'FKxYepkd0IbDXRc+mltCXbDKe7KH1cE5/Ytkyw0ol28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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