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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b9345608d3bd337d0b5b26e319ba90571f36629ae27b30952e03283889abcfb' 
  AND token = 'P1xDWj9piS2vWxQ/exBcZYqdOLtWSnT4wGq/r725sL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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