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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fe66b9b01bf3ba51a0b585aeecde53e828e8e159d5b68a82e5e199f0c7ca3a1' 
  AND token = 'LGuvUIkTQ/IVcUxTBmYJgn+pojyekcvnh4vVszWWs8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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