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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de9ee138dd6f2c18bbf62a67addd8119539800c2deaa20977956ca45147cc979' 
  AND token = '3iZWpP5AgkJk53EAzy2CxpRZ8xNvOxut0eY7eOFAgbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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