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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3779ec2feb1a11bf2ba6a9b04d028e5df4c0459ec08bfa6c7d336a0f0eef1b50' 
  AND token = 'Q3kHtOvYVluZsOQNDd+u6v+licsa6ao+HCryY0EJrxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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