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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56a606b26190f733008603d4f96d97b19713e02bceff142ce2de6b01ffa5c327' 
  AND token = '//7T7tyTC0R75yRa5HopVAbP5lF1cbLBAWVPWYxWwGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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