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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19d762bc37025550b27d4b04f7913aa35f90c969d7dec81c86e0454105c38da5' 
  AND token = 'Xr4vYmPOUEb14IfijtVw5Hkb9UdNEvdmd+iQ255gnT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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