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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71e733b4c48304a8e047e090601a82d9bdd399c7a1908bb19c06242840db3bc8' 
  AND token = 'UmoXjbqMXOJ45eYaYwkm79FoUBRMRONkU8915s25Hy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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