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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4fa4a0d1761dc5a5ee2d7e8e0c0c298a5dd4bc2d5002f07b78d8abfa2e5062e' 
  AND token = 'uNZhiZEnbt5vZz6EAE2Z5s2YjmD2CBLFWlCHNe1d7tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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