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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bee31cb34de9f0d5a0371707122e4ac408d1c9f4a09016340fe0d955ce99d937' 
  AND token = 'JDvf1RfoVtDYmAbv8OeDGgiPYyR5UZC7V7WTm6w5mGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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