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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a1dab78c541540e3f9a307cb87d251b9cb5dbc17674fff00c678cd6cbecac38' 
  AND token = 'gSj3h3R31IRzGt/d2u0d9D324/Hb7w5OCwio8ff6rwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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