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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3dec2f342a53a739492cd123caac903d0a1a54f6e3c301c1fc2c12538dce9bc' 
  AND token = '/kBYffaiVOTFXdLsBfvCOCfPQB650PtJR7qhMLrmP2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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