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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e82b3fc91898692e95e9ba226bd06ca388e109a3fcf0cb40abf5f0eabe4e4cd' 
  AND token = 'LkraSsJnaN/o2RHpDAohd1z+fC0N1Bk6ixOnWaxiJxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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