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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe4f0f0e785c7c9f32e2308119b0f4bc5a2e8a8c39dab031c98030f426c40065' 
  AND token = 'rGX5ZivwHeOK0QNaIltk6Fe7/QTY/5EgZLMCoNUPey4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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