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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '364cf4ecb7a6c141e58b1abb156bb794314f9d53c0a74c95501628c7d04a8962' 
  AND token = 'Rto8amChTzpesX4FVsZTlE94ev7qEfhhKReVfey8YhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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