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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dbcbfd5d43c35e1175bd42f4d8536d7b7c9e84cde08ac0d293be24c1bbccf20' 
  AND token = 'tl70sANg1w4P8IcJ2TbC1OlvTrvSEEnK5BzdbsJv9jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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