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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3fcca86d2b1187c610ffb3e076f842d57257fbcac989781b28d8e905a1a22f6' 
  AND token = 'o+x2W+2pJq1csgW1FU3LNbHzbDs3vXML2na3qI69/vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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