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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb2115104898a7fbd050da7a424405c55e9d1ce6c0715e6a90c2edf2484e36ca' 
  AND token = '6LtQLQSdtXI9IZQaFWt0PT9OtELE8xZ7XuI1SEO7FuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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