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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49f4b40b4118da83ab7ee1a3ee927524a5b0560a31b4457b1205980860070e7b' 
  AND token = 'CYVXNjrxOnmH5qg742wKP+Xw7fYWVi1U0oMolT+N/q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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